Hi,
I stayed at Pop Century from May 31 to June 4, 2007, and I liked the hotel. I have never stayed at a value resort before, but I have stayed at many of Disney's moderate, deluxe and DVC resorts in the past. I chose Pop Century this time as it was a solo trip without my wife and children (I was on a business trip for two weeks in the southern U.S. and I found a very cheap fare to Orlando for the [long] weekend in between my days of work).
I loved the 60's and 70's music playing at the hotel. I liked the cultural icons, especially the funny song names on the huge 8-track tapes. The food court was attractively decorated and had lots of great selections. The pools were very big. The room itself was clean and well-maintained. It was the end of love bug season so a couple of love bugs managed to fly into the room, but the room itself was great.
The only negatives about Pop Century were the small beds (though not a problem for me on a solo trip), and a lack of a fridge as standard room equipment. This would be common to all value resorts, I would guess.
Note that my room at Pop Century had an in-room safe just big enough to store my laptop.
Bottom line is that I thought Pop Century was a very nice hotel and I enjoyed my stay there. For such a nice hotel the price was very low compared to moderate or deluxe resorts.